期刊
IEEE TRANSACTIONS ON ENERGY CONVERSION
卷 37, 期 1, 页码 50-64出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2021.3096991
关键词
Rotors; Windings; Stator cores; Coils; Stator windings; Iron; Harmonic analysis; Brushless excitation; dc-field excitation; generator
资金
- National Natural Science Foundation of China Project [51807090]
- Natural Science Foundation of Jiangsu Province [BK20180428]
- Aviation Science Foundation [20182852020]
- Fundamental Research Funds for the Central Universities [NT2021010]
In this paper, a double electrical excitation synchronous generator with an embedded brushless exciter is proposed to achieve brushless excitation. By placing additional stator excitation windings in the stator slots with the armature coils, a static magnetic field is generated. There are two sets of windings on the rotor, and the AC voltage induced by the static magnetic field provides DC excitation current for the main excitation winding, enabling excitation of the armature coils.
A double electrical excitation synchronous generator (DEESG) with an embedded brushless exciter is proposed to achieve brushless excitation for a brush excitation electrical excitation synchronous generator (EESG). A set of extra stator excitation windings is placed in the stator slots with armature coils to generate a static magnetic field. There are two sets of windings on the rotor: pulsating excitation winding (W-p) and main excitation winding (W-F). The winding direction of the coils of W-p and W-F on the same rotor-pole-body is the same. The AC voltage of W-p which is induced by static magnetic field provides dc excitation current for W-F by diodes. Both currents in the coils of the W-p and W-F generate the rotor excitation flux which induces voltage in the armature coils. In this study, the operating principle is analyzed theoretically. The no-load and load characteristics are studied using Maxwell. The influence of the novel winding structure on the output voltage when the load varies is also analyzed. The voltage regulation rate of DEESG is reduced because the rotor excitation currents can be increased with armature current. A 1.5 kVA prototype is fabricated for experiment. The measured results agree well with the theoretical and FE-predicted results.
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